Bump RestSharp to 111.4.1

---
updated-dependencies:
- dependency-name: RestSharp
  dependency-version: 111.4.1
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: RestSharp
  dependency-version: 111.4.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/dnsimple/dnsimple.csproj

@@ -31,7 +31,7 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="RestSharp" Version="106.15.0" />
+    <PackageReference Include="RestSharp" Version="111.4.1" />
   </ItemGroup>
 
 </Project>